(Objective-C) Check PayPal Access Token Expiration

Checks to see if the PayPal access token expired.

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#import <CkoJsonObject.h>
#import <CkoDateTime.h>

// Note: Requires Chilkat v9.5.0.64 or greater.

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// In the example linked here: PayPal OAuth2 Token,
// we fetched a PayPal access token and saved it to a JSON file.
// We also recorded the current date/time.
// Load this JSON file and compare the current date/time with the fetch date/time
// and the "expires_in" value to see if the token is expired.

CkoJsonObject *json = [[CkoJsonObject alloc] init];
BOOL success = [json LoadFile: @"qa_data/tokens/paypal.json"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load access key json file.");
    return;
}

// Get the current date/time.
CkoDateTime *dateTime = [[CkoDateTime alloc] init];
BOOL bLocalTime = NO;
int dtNow = [dateTime GetAsUnixTime: bLocalTime];

// Get the access token create date/time
int dtCreate = [[json IntOf: @"tokenCreateTimeUtc"] intValue];

// Find out how many seconds have elapsed.
int numSeconds = dtNow - dtCreate;

// Get the expires_in value from the JSON.
int expires_in = [[json IntOf: @"expires_in"] intValue];

NSLog(@"%@%d",@"token age (in seconds) = ",numSeconds);
NSLog(@"%@%d",@"expires_in = ",expires_in);

// If the token expired, or if it will expire in 5 minutes or less,
// get another token.
if (numSeconds < (expires_in - 300)) {
    NSLog(@"%@",@"The token is not yet expired.  No need to fetch another.");
    return;
}

NSLog(@"%@",@"Time to fetch a new access token...");

// Get another token..
// See the example at Get PayPal OAuth2 Token
// to get another token..